package thread;

public class SyncApiDemo1 {
    public static void main(String[] args) {
//        StringBuilder sb = new StringBuilder();
        StringBuffer sb = new StringBuffer();
        Thread t1 = new Thread(){
            public void run(){
                for(int i = 0 ; i < 1000 ; i++){
                    sb.append("hello");
                }
            }
        };
        Thread t2 = new Thread(){
            public void run(){
                for(int i = 0 ; i < 1000 ; i++){
                    sb.append("world");
                }
            }
        };
        t1.start();
        t2.start();

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(sb.length());
    }
}
